Biopolymer-assisted synthesis of 3D interconnected Fe3O4@carbon core@shell as anode for asymmetric lithium ion capacitors. (December 2018)

• Record Type: Journal Article
• Authors: Han, Cuiping; Xu, Lei; Li, Hongfei; Shi, Ruiying; Zhang, Tengfei; Li, Junqin; Wong, Ching-Ping; Kang, Feiyu; Lin, Zhiqun; Li, Baohua
• Is Part Of: Carbon. Volume 140(2018)
• Page Start: 296
• Page End: 305
• Publication Date: 2018-12
• Subjects: Supercapacitor -- Lithium ion battery -- Fe3O4 -- Carbon coating -- Specific energy; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2018.09.010
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Lithium ion capacitor (LIC) has been regarded as a promising device to combine the merits of high-energy lithium ion battery and high-power supercapacitor. The key challenge in developing high performance LIC is to achieve synergy between the high capacity of battery anode and the fast non-Faradaic reaction rate of capacitive cathode without compromising energy density. Here, we report 3D interconnected Fe3 O4 @C core@shell nanocomposites with enhanced lithium storage reaction kinetics as an anode material of LIC. Chitosan, a renewable biopolymer with rich functional groups, has been utilized as both structural directing agent and carbon precursor to assist the synthesis of Fe3 O4 @C composites, which have small particle size and an in-situ formed carbon coating layer. The carbon coating can not only dramatically improve the electronic conductivity, but also buffer the large volume expansion/contraction of Fe3 O4 during lithiation/delithiation. The Fe3 O4 @C composites show a reversible capacity of 1116.1 mA h g −1 at 0.1 A g −1 and 587.2 mA h g −1 at 2 A g −1, as well as stable capacity retention over cycling. Furthermore, the hybrid device based on Fe3 O4 @C composites achieves a specific energy of 110.1 Wh kg −1 at a specific power of 250 W kg −1, demonstrating promising application of the reported hybrid systems. Graphical abstract: A lithium ion battery and supercapacitor hybrid device has been constructed with novel designed 3D interconnected Fe 3 O 4 @C anode prepared using chiotsan biopolymer, which combines high energy density and high power density simultaneously. The hybrid device achieves an exceptional energy density of 110.1 Wh kg −1 at a specific power of 250 W kg −1 with outstanding capacity retention. Image 1